Browsing Materials, Energy, Water and Environmental Sciences by Title
Now showing items 240-259 of 579
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Hybrid CV-CC operation of capacitive deionization in comparison with constant current and constant voltage
(Taylor & Francis Online, 2016-02-24)Capacitive deionization (CDI) is a technique used to desalinate saline water by means of electrical potential applied to the electrode along both sides of a spacer channel through which water flows. CDI operates either at ... -
Hybrid Reverse Osmosis‐Capacitive Deionization versus Two‐Stage Reverse Osmosis: A Comparative Analysis
(John Wiley & Sons, Inc., 2014-06-06)Reverse osmosis (RO) is a high‐pressure single‐phase desalination process used to obtain freshwater from seawater/brackish water. The RO system shows high energy consumption for a given unit volume of pure water produced. ... -
The hydrochemical evolution and water balance of the emakat lake in the northern crater highland of Tanzania
(NM-AIST, 2023-07)This study aimed to ascertain the hydrochemical evolution and water balance of Emakat Lake, of the Empakaai Crater. Water and rock samples were collected from the lake and springs on the inner and outer crater rims, and ... -
Hydrogen sulfide and ammonia removal from biogas using water hyacinth-derived carbon nanomaterials
(Academic Journals, 2017-07-31)The presence of hydrogen sulfide (H2S) and ammonia (NH3) in biogas pose serious human health and environmental challenges. In this study, H2S and NH3 were successfully removed from biogas using water hyacinth-derived ... -
Hydrogeochemical characteristics and spatial distribution of groundwater quality in Arusha well fields, Northern Tanzania
(Springer, 2018-07-09)Arusha aquifers have been exploited intensively serving as the main source of domestic water supply in the city. But the quality of groundwater is not clearly documented for future planning and management. Hydrogeochemical ... -
Hydrogeochemical similarities and groundwater-surface water interactions for the karst hydrological system of northwest Rwanda
(Springer International Publishing, 2023-08)The groundwater of karst environments is vulnerable to pollution due to its heterogeneous nature and can be completely depleted due to its strong connection to surface water when predominantly driven by natural and ... -
Hydrologic responses to climate and land use/cover changes in world heritage site of Ngorongoro conservation area and surrounding catchments, northern Tanzania
(NM-AIST, 2023-01)In Tanzania, various studies have analyzed the impact of climate and land use/cover changes on water resources. However, information on the interactions between climate and land use/cover change, temporal and spatial ... -
Hydrological System and Water Balance of Ungauged Crater Lakes of the Northern Crater Highlands
(Tanzania Journal of Engineering and Technology, 2023-10)The study aimed to unveil the hydrological system and water balance of the ungauged crater lakes with major focus on the Emakati Lake which occupy 46% of the Empakaai Crater associated to the East African Rift Valley ... -
Hydroxyapatite-activated seaweed biochar for enhanced remediation of fluoride contaminated soil at various pH ranges
(Elsevier, 2022-12-10)This study investigated the defluoridation efficiency of hydroxyapatite-activated seaweed (Eucheuma Cottonii) biochar (HSB) at various soil pH ranges (3–11) while monitoring the impact of contact time (30 min - 2.5 h), ... -
Impact of Antioxidant Additives on the Engine Performance and Exhaust Emissions Using Biodiesel made from Jatropha Oil of Eastern Africa Origin
(Journal of the South African Institution of Mechanical Engineering, 2016)Biodiesel’s chemical nature makes it more susceptible to oxidation in comparison to mineral diesel. Biodiesels are doped with antioxidants to increase oxidation stability for long term storage. However, it is quite ... -
Impact of antioxidant additives on the oxidation stability of biodiesel produced from Croton Megalocarpus oil
(Elsevier Ltd., 2011-06)The increase in crude petroleum prices, limited resources of fossil fuels and environmental concerns have led to the search of alternative fuels, which promise a harmonious correlation with sustainable development, energy ... -
Impact of climate change on groundwater recharge in lake Manyara catchment
(2020-08)This study aimed to estimate the groundwater recharge of the Lake Manyara catchment (7920 km2) in two different time intervals, historical 1988-2018 and near-future 2021-2050 climatic condition. This study analyzed the ... -
Impact of climate change on groundwater recharge in the lake Manyara catchment, Tanzania
(Elsevier, 2021-12-15)Groundwater account for about 60 to 80% of water supply to the population of Tanzania's semi-arid regions for domestic and agriculture uses. Despite the importance of groundwater resource in semi-arid areas, limited ... -
Impact of tobacco curing on the environment andsocio-economic aspects in the Urambo District
(NM-AIST, 2021-07)Despite the efforts that have been employed to reduce tobacco curing related deforestation in many countries including Tanzania. The economic importance of tobacco production on employment creation and foreign exchange ... -
Impacts of Emerging Agricultural Practices on Groundwater Quality in Kahe Catchment, Tanzania
(MDPI, 2019)This paper assesses the impacts of farmers’ intensive use of agrochemicals (fertilizers and pesticides) on groundwater quality in the Kahe catchment. Samples were collected during the wet and dry seasons of the year 2018 ... -
Impacts of future climate and landuse changes on surface-groundwater balance in Usangu catchment
(NM-AIST, 2019-02)This study was undertaken to assess the impacts of future climate and land use/cover changes on surface-subsurface water balance in Usangu catchment, located in the Southern highlands of Tanzania. The objectives of the ... -
Impacts of irrigation water quality, associated soils characteristics and on-farm practices on paddy yields
(NM-AIST, 2022-07)In this study, the impacts of irrigation water quality, soil characteristics and on-farm practices on paddy yields were investigated. Standard spectroscopy and spectrometry methods were used to analyze irrigation water ... -
Impacts of Synthetic and Botanical Pesticides on Beneficial Insects
(Scientific Research Publishing, 2016-06-17)Sustainable methods to control insect pests that affect crop yield have become a great challenge to mainly smallholder farmers. Beneficial insects in agricultural fields play an important role in natural pest control and ... -
Impacts of Wood Fuel Uses on Forest Cover: The Case of Semiarid Areas in Northern Tanzania
(University of Dar es Salaam, 2021)Satellite images for the years 1987, 1997, 2002 and 2017, and questionnaire surveys were used to assess energy sources and demands as well as the impacts of wood fuel use to forest cover changes in Meru and Mwanga ... -
Improving biological treatment of textile wastewater
(IWA Publishing, 2022-01-01)Textile industries are among the primary contributors of water pollution. Treatment of textile wastewater is very important before discharging it to the environment. In the present study, laboratory-scale anaerobic batch ...